1// Copyright 2009 the V8 project authors. All rights reserved.
2// Redistribution and use in source and binary forms, with or without
3// modification, are permitted provided that the following conditions are
4// met:
5//
6//     * Redistributions of source code must retain the above copyright
7//       notice, this list of conditions and the following disclaimer.
8//     * Redistributions in binary form must reproduce the above
9//       copyright notice, this list of conditions and the following
10//       disclaimer in the documentation and/or other materials provided
11//       with the distribution.
12//     * Neither the name of Google Inc. nor the names of its
13//       contributors may be used to endorse or promote products derived
14//       from this software without specific prior written permission.
15//
16// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27
28#include "v8.h"
29
30#include "codegen-inl.h"
31#include "register-allocator-inl.h"
32
33namespace v8 {
34namespace internal {
35
36// -------------------------------------------------------------------------
37// Result implementation.
38
39void Result::ToRegister() {
40  ASSERT(is_valid());
41  if (is_constant()) {
42    Result fresh = CodeGeneratorScope::Current()->allocator()->Allocate();
43    ASSERT(fresh.is_valid());
44    CodeGeneratorScope::Current()->masm()->Move(fresh.reg(), handle());
45    // This result becomes a copy of the fresh one.
46    *this = fresh;
47  }
48  ASSERT(is_register());
49}
50
51
52void Result::ToRegister(Register target) {
53  ASSERT(is_valid());
54  if (!is_register() || !reg().is(target)) {
55    Result fresh = CodeGeneratorScope::Current()->allocator()->Allocate(target);
56    ASSERT(fresh.is_valid());
57    if (is_register()) {
58      CodeGeneratorScope::Current()->masm()->movq(fresh.reg(), reg());
59    } else {
60      ASSERT(is_constant());
61      CodeGeneratorScope::Current()->masm()->Move(fresh.reg(), handle());
62    }
63    *this = fresh;
64  } else if (is_register() && reg().is(target)) {
65    ASSERT(CodeGeneratorScope::Current()->has_valid_frame());
66    CodeGeneratorScope::Current()->frame()->Spill(target);
67    ASSERT(CodeGeneratorScope::Current()->allocator()->count(target) == 1);
68  }
69  ASSERT(is_register());
70  ASSERT(reg().is(target));
71}
72
73
74// -------------------------------------------------------------------------
75// RegisterAllocator implementation.
76
77Result RegisterAllocator::AllocateByteRegisterWithoutSpilling() {
78  // This function is not used in 64-bit code.
79  UNREACHABLE();
80  return Result();
81}
82
83
84} }  // namespace v8::internal
85